A 34-year-old man who worked at a Long Island day camp has been charged in a 112-count indictment alleging sex crimes and possession of child pornography.

Keith Meyn, of Oakdale, pleaded not guilty Tuesday in Suffolk County court to allegations he used an 11-year-old boy in sexual performances and also possessed a massive collection of child pornography featuring young boys less than 16 years of age.

Suffolk County District Attorney Thomas Spota said Meyn, who is believed to have been employed at Camp Kenwal in Melville as a group leader, camp counselor and most recently as the director of maintenance operations, appears to have participated in illegal activity involving children for over a decade.

Spota said the investigation revealed that Meyn was previously associated with a film company, Psych Ward films, and modeling agencies Camden Enterprises and StoneAge Enterprise.

"The defendant participated in disturbing photography and videography featuring young boys," he said. "We believe there are more victims of this predator out there, and we are asking them to come forward, even if the crimes happened years ago."

Victims and others with knowledge helpful to the investigation are urged to call the Suffolk County Police Department Computer Crimes Unit at (631) 852-6279. All calls are confidential.

Meyn is charged with criminal sexual act, use of a child in a sexual performance as a sexually-motivated felony, sexual abuse, endangering the welfare of a child, and 100 counts of possessing a sexual performance by a child. If convicted of all charges, Meyn faces 50 years in prison.